15785738640 has 240 divisors, whose sum is σ = 60658605696. Its totient is φ = 3603916800.

The previous prime is 15785738611. The next prime is 15785738653. The reversal of 15785738640 is 4683758751.

It is a happy number.

15785738640 is a `hidden beast` number, since 1 + 5 + 7 + 8 + 573 + 8 + 64 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6656655 + ... + 6659025.

Almost surely, 2^15785738640 is an apocalyptic number.

15785738640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15785738640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30329302848).

15785738640 is an abundant number, since it is smaller than the sum of its proper divisors (44872867056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15785738640 is a wasteful number, since it uses less digits than its factorization.

15785738640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3718 (or 3709 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 54.

The spelling of 15785738640 in words is "fifteen billion, seven hundred eighty-five million, seven hundred thirty-eight thousand, six hundred forty".